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Old November 11th, 2013, 12:29 PM   #1
unclemyke
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Default 2001 24 valve Cummins

Just got my Cummins back together after forever.... Needed a head gasket. Had head cleaned up, all new gaskets, new head bolts, etc.....
Starts fine, and runs fine(above idle), but seems like it's idling rough, and is blowing smoke(at idle). Check engine light was on this morning on my way to work....it's off now.
Where should I begin my investigation?
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Old November 11th, 2013, 02:23 PM   #2
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Check to see what the code was first.
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Old November 11th, 2013, 02:33 PM   #3
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Will it show up if the light isn't on?
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Old November 11th, 2013, 02:54 PM   #4
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Check for fuel leaks? How long did u let it run before you called it good?
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Old November 11th, 2013, 04:48 PM   #5
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Half hour ride to work. On my way home now. Still smoking. Definitely raw fuel. Idling at 750-800, kinda rough. No check engine light.

Really rough as a matter of fact....

Last edited by unclemyke; November 11th, 2013 at 04:59 PM.
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Old November 11th, 2013, 05:29 PM   #6
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Old gas?
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Old November 11th, 2013, 08:49 PM   #7
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Quote:
Originally Posted by t_ank View Post
Old gas?
Old gas might be the problem.

OP, check your fuel for any old gas.

LAY SOME PIPE
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Old November 11th, 2013, 09:19 PM   #8
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Yea I hear you can rent a old gas in diesel fuel meter from auto zone... LAY LOTS OF PIPE The code will stay stored until cleared even if the lights off. I would start with finding out what the code was. Any idea why the idle is high? Check for boost leaks. Doesn't really sound like a lack of fuel problem.
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Old November 11th, 2013, 10:27 PM   #9
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Trying to find someone with a scanner....
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Old November 11th, 2013, 11:05 PM   #10
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Autozone will scan it for u

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Old November 12th, 2013, 05:48 PM   #11
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Ok....now for today's findings.

Started truck today after work...running pretty rough...left without letting it warm up...pulled out into traffic, bogged bad, big cloud of black smoke and it took off like a bat outta hell! Immediately got stopped at a light, and it idled like a purring kitten....with no smoke...

Hmmmmmm....

Noticed as it got closer to operating temperature, it started to "miss" again...warmer it got, worse it ran, and the smokier it got(at idle).
Stopped at autozone for a scan...came up with a bad IAT, and a bad MAP.
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Old November 12th, 2013, 06:05 PM   #12
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If smoking that much MAP sensor for sure check all wires to map sensor as for rough idle IAT can cause that, almost like its going into a 3 cylinder high idle
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Old November 12th, 2013, 08:06 PM   #13
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Definitely high idle.....800+rpm. And idles like it's on 3cyl. LOL.
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Old November 12th, 2013, 08:45 PM   #14
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Last year my buddys duramax sounded like it was running on 3-4 cyl and ran idled like shit. Smoked at idle. Ended up being an injector was bad and stuck wide open. Hope it helps.
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Old November 12th, 2013, 09:12 PM   #15
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So far, from what I've found on the ol' interweb.....everything points to injectors. They were sitting for quite a while(since March or April) b4 I was able to get the motor back together last week.

Last edited by unclemyke; November 13th, 2013 at 10:01 AM.
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Old November 13th, 2013, 06:59 PM   #16
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With a bad map sensor it will still run 100% fine....it will just have no power at all till 12-1400rpm then it will take off and run fine....this is because the sensor does register boost so it doesn't fuel....once it gets up so far it just defaults and takes off. At least that's what mine did when the map sensor died. I am betting yours is an injector issue caused by sitting. Why was it apart so long? That head gasket is super easy.
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Old November 13th, 2013, 11:16 PM   #17
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Lol. Lack of time and money(mostly time).
The more I read...the more I think I may have multiple problems. Did a few full throttle blasts this evening, and it almost seems like it's missing under heavy throttle, ONLY when the tuner is on and turned up though. Tuner off....no surging or missing under heavy foot. Idles the same tuner on or off(horrible and smokey).
I hope I you guys can help me figure this out! I don't have a lot of money to just throw at it until something fixes it....
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Old November 14th, 2013, 03:09 PM   #18
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I dont know shit about diesels but I can read the code for you.

nvm just saw you already did that.
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Last edited by rammanriley; November 14th, 2013 at 03:09 PM. Reason: I dont read good
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Old November 14th, 2013, 05:02 PM   #19
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Ok.....left work today(again without warming up first), stepped on it, bogged, giant cloud of smoke...went like a bat outta hell.

Again....

Got up to operating temperature, but was still running fine. So.....that leads me to believe it's not the operating temp of the motor itself, but something around the motor that is getting hot from the heat coming off the motor. I say this because not too far down the road, it started the missing and smoking again.


Also noticed that in o/d at lower speeds, it's bucking.

This thing is starting to sound worse and worse!
Does anyone know a diesel mechanic in my neighborhood that's not gonna try and rape me? Maybe someone who can tell me what's wrong so I can fix it. I just can't afford that kind of labor, on top of possible parts.
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Old November 14th, 2013, 05:09 PM   #20
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Possibility the computer on your VP44 pump?
Those are prone to heat failure.

Www.heathdiesel.com and you can find directions to diagnose the computer there.



sended frum dis stoopid fone
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